by federal authorities. but in the beginning, he will not be given theusualmirandawarningabout the right to remain silent. instead, the government will invoke a rule that allows questioning a suspect without giving advice of rights. >> there is a public safety exemption in cases of national security, and central charges involving acts of terrorism, and so government has that opportunity right now. >> the government invoked that same rule in the case of the so-called underwear bomber. as in his case, it allows questioning to learn of any potential plots or accomplices that could present a continuing threat. >> the first questions the fbi will focus on are specific threats that he might be aware of. likely, are there any other improvised explosive devices? were there other people working in the network? the sorts of things that go directly to whether or not there's a continuing threat to public safety. >> reporter: he'll face charges brought by the justice department, because terrorism is a federal crime with a trial in a regular civilian court. and as in other high profile terrorism cases